Introduction: Blinking Musical Note


  • 4 LED lights (turquoise, blue)
  • CNC machine
  • Wire
  • SolidWorks
  • 3D printer
  • Soldering Iron and solder
  • 2 200 Ohm resistors
  • Hot glue
  • 9 Volt battery and snap connector
  • Drill

This project is very simple and should not take very long to make. It is a piece that can be used for decoration. I based this project on my love for music and playing the piano. I always like to find something new to put as decoration around my piano, and thought that this would be something fun to incorporate. The LED lights that you can see in the picture work fine. It is just that I could not capture all 4 of them on at the same time.

Step 1: Make Your Sketch

Here I just made a sketch of what I had in mind for my note to look like. I made sure to get my measurements how I wanted them.

6 inches wide

Right leg 5.5 inches long

Left leg 5 inches long

Bottom of each note 1.5 inches wide

I also made a sketch for a battery holder. This was made in mm.

Step 2: Design on SolidWorks

Here I designed everything on SolidWorks and made adjustments along the way. I made sure to follow the measurements that I had on my sketch. Before starting your design on SolidWorks you need to make sure that your measurements are in inches.

I designed most of the perimeter with 3 point arcs but you can choose to make it with straight lines. I did not have a specific measurement for the width of the legs and the arch in the middle. I just made it look how I desired, you can do the same thing.

Last thing I did which did take me a couple of times to get it how I desired was the actual note part. I made them with the spline. You can make those however you prefer.

For the battery holder I made it so the thinner side of the battery would be on the wood, this helps hide the battery so you can't see it from the front. I made the entire thing with lines and circles for the cut extruded circles. Those are to help with the glue. Make sure you make it in mm.

The battery holder is the only thing that will be 3D printed

Step 3: Cutting Out on CNC Machine

Here I cut out the musical note on the CNC machine. The arch was cut out first, then the rest of the note was cut out.

After it was cut out I sanded all the edges and wherever else I needed to.

Step 4: Paint and Drill Holes

Here I painted the musical note black. You can paint it any color that you would like.

After letting it dry completely I drilled the holes where I wanted the LED lights to go. I put the tape where I drilled because this helped the edges where the holes were drilled to be smooth.

Make sure that the drill bit you use is big enough so that the LED lights can fit. It does not need to be a super tight fit, but tight enough so that the lights don't go through the holes or move around.

Step 5: Soldering and Finishing Steps

I created a series parallel circuit. I had the negative side of each LED to face towards the bottom. You can tell which leg is the negative one, because each LED has a little flat side, or one of the legs is shorter. While I was soldering the battery holder was printing. It did not take long at all, though when you follow the measurements on the sketch, the walls will be taller. The 3D printer I was using had crashed and stopped printing but was lucky enough that the battery still fit fine.

I tested how many Ohms my resistor needed to have.

  • 200 Ohm resistors
  • I tinned the end of each wire I used
  • I then soldered the resistor as you can see in the picture, to the negative leg of the LED on the top left corner. I then used a short wire to connect it to the positive leg of the LED below it. I did the same to the other side.
  • Then I soldered a red wire that runs at the very top from one positive leg to the other.\
  • I then soldered a black wire that ran from one negative leg to the other. I tried to bend the wire so that it follows the shape of the note in order to try and hide it.
  • Last but not least for the soldering. I stripped the ends of the 9 volt battery snap connector, just enough to twist around other wire. I twisted the red wire of the connector around where the other red wire meets the LED on the top left as you can see in the picture. I twisted the black wire of the connector around where the other black wire meets the LED on the bottom left.
  • That is the end of soldering, now just test it with a 9 volt battery to make sure it works.

Last step is to glue the battery holder onto the wood with hot glue.